<template>
    <div :style="{width:tableWidth}" class="autoTbale">
        <table class="table hl-tree-table">
            <thead>
                <tr>
                    <th v-for="(column,index) in cloneColumns" :key="index">
                        <label v-if="column.type === 'selection'">
                            <Checkbox v-model="checks" @on-change="handleCheckAll"></Checkbox>
                        </label>
                        <label v-else>
                            <label v-if="!column.type && index==iconRow()"></label>
                            <span>{{ renderHeader(column, index) }}</span>
                            <span class="ivu-table-sort" v-if="column.sortable">
                                <Icon
                                    type="arrow-up-b"
                                    :class="{on: column._sortType === 'asc'}"
                                    @click.native="handleSort(index, 'asc')"
                                />
                                <Icon
                                    type="arrow-down-b"
                                    :class="{on: column._sortType === 'desc'}"
                                    @click.native="handleSort(index, 'desc')"
                                />
                            </span>
                        </label>
                    </th>
                </tr>
            </thead>
            <tbody>
                <tr
                    v-for="(item,index) in initItems"
                    :key="item.id"
                    v-show="show(item)"
                    :class="{'child-tr':item.parent, 'body-tr':true}"
                >
                    <td
                        v-for="(column,snum) in columns"
                        :key="column.key"
                        :style="tdStyle(column)"
                        @click="toggle(index,item)"
                    >
                        <label v-if="column.type === 'selection'">
                            <Checkbox
                                :label="item.id"
                                v-model="ch[item.id]"
                                @on-change="handleCheckClick(item,$event,index)"
                            ></Checkbox>
                        </label>
                        <div v-if="column.type === 'action'">
                            <i-button
                                :type="action.type"
                                size="small"
                                @click="RowClick(item,$event,index,action.text)"
                                v-for="action in (column.actions)"
                                :key="action.text"
                            >{{action.text}}</i-button>
                        </div>
                        <label v-if="!column.type">
                            <span v-if="snum==iconRow()">
                                <i v-html="item.spaceHtml"></i>
                                <Icon
                                    v-if="item.children&&item.children.length>0"
                                    :type="item.expanded?'ios-arrow-down':'ios-arrow-forward'"
                                    size="16"
                                    style="margin-right:4px;cursor:pointer;color:gray;"
                                ></Icon>
                                <i v-else class="ms-tree-space"></i>
                            </span>
                            <span>{{renderBody(item,column) }}</span>
                        </label>
                    </td>
                </tr>
            </tbody>
        </table>
    </div>
</template>
<script>
export default {
    name: 'TreeTableEx',
    props: {
        columns: Array,
        items: {
            type: Array,
            default: function () {
                return [];
            }
        }
    },
    data() {
        return {
            initItems: [], //处理后数据数组
            cloneColumns: [], //处理后的表头数据
            checkGroup: [], //复选框数组
            checks: false, //全选
            screenWidth: document.body.clientWidth, //自适应宽
            tdsWidth: 0, //td总宽
            timer: false, //控制监听时长
            dataLength: 0, //树形数据长度
            listItems: []
        }
    },
    computed: {
        tableWidth() {
            return this.tdsWidth > this.screenWidth && this.screenWidth > 0 ? this.screenWidth + 'px' : '100%'
        },
        ch() {
            let m = {}
            this.listItems.forEach(e => {
                m[e.id] = this.checkGroup.indexOf(e.id) >= 0
            })
            return m
        }
    },
    watch: {
        screenWidth(val) {
            if (!this.timer) {
                this.screenWidth = val
                this.timer = true
                setTimeout(() => {
                    this.timer = false
                }, 400)
            }
        },
        items() {
            if (this.items) {
                this.dataLength = this.Length(this.items)
                this.initData(this.deepCopy(this.items), 1, null);
                this.checkGroup = this.renderCheck(this.items)
                if (this.checkGroup.length == this.dataLength) {
                    this.checks = true
                } else {
                    this.checks = false
                }
            }
        },
        columns: {
            handler() {
                this.cloneColumns = this.makeColumns();
            },
            deep: true
        },
        checkGroup(data) {
            this.checkAllGroupChange(data)
        },
    },
    mounted() {
        if (this.items) {
            this.dataLength = this.Length(this.items)
            this.initData(this.deepCopy(this.items), 1, null);
            this.cloneColumns = this.makeColumns();
            this.checkGroup = this.renderCheck(this.items)
            if (this.checkGroup.length == this.dataLength) {
                this.checks = true
            } else {
                this.checks = false
            }
            this.listItems = this.treeToList(this.items)
        }
        // 绑定onresize事件 监听屏幕变化设置宽
        this.$nextTick(() => {
            this.screenWidth = document.body.clientWidth
        })
        window.onresize = () => {
            return (() => {
                window.screenWidth = document.body.clientWidth
                this.screenWidth = window.screenWidth
            })()
        }
    },
    methods: {
        // 有无多选框折叠位置优化
        iconRow() {
            for (var i = 0, len = this.columns.length; i < len; i++) {
                if (this.columns[i].type == 'selection') {
                    return 1
                }
            }
            return 0
        },
        treeToList(t) {
            let r = []
            t.forEach(e => {
                r.push({ ...e, children: null })
                if (e.children) {
                    let w = this.treeToList(e.children)
                    r = r.concat(w)
                }
            })
            return r
        },
        // 设置td宽度,td的align
        tdStyle(column) {
            var style = {}
            if (column.align) {
                style["text-align"] = column.align;
            }
            if (column.width) {
                style["width"] = column.width + 'px';
            }
            if (column.minWidth) {
                style["min-width"] = column.minWidth + 'px';
            }
            return style;
        },
        // 排序事件
        handleSort(index, type) {
            this.cloneColumns.forEach((col) => col._sortType = 'normal');
            if (this.cloneColumns[index]._sortType === type) {
                this.cloneColumns[index]._sortType = 'normal'
            } else {
                this.cloneColumns[index]._sortType = type
            }
            this.$emit('on-sort-change', this.cloneColumns[index]['key'], this.cloneColumns[index]['_sortType'])
        },
        // 点击某一行事件
        RowClick(data, event, index, text) {
            let result = this.makeData(data)
            this.$emit('on-row-click', result, event, index, text)
        },
        // 点击事件 返回数据处理
        makeData(data) {
            const t = this.type(data);
            let o;
            if (t === 'array') {
                o = [];
            } else if (t === 'object') {
                o = {};
            } else {
                return data;
            }
            if (t === 'array') {
                for (let i = 0; i < data.length; i++) {
                    o.push(this.makeData(data[i]));
                }
            } else if (t === 'object') {
                for (let i in data) {
                    if (i != 'spaceHtml' && i != 'parent' && i != 'level' && i != 'expanded' && i != 'isShow' && i !=
                        'load') {
                        o[i] = this.makeData(data[i]);
                    }
                }
            }
            return o;
        },
        // 处理表头数据
        makeColumns() {
            let columns = this.deepCopy(this.columns);
            this.tdsWidth = 0
            columns.forEach((column, index) => {
                column._index = index;
                column._width = column.width ? column.width : '';
                column._sortType = 'normal';
                this.tdsWidth += column.width ? parseFloat(column.width) : 0;
            });
            return columns;
        },
        // 数据处理 增加自定义属性监听
        initData(items, level, parent) {
            this.initItems = []
            let spaceHtml = "";
            for (var i = 1; i < level; i++) {
                spaceHtml += "<i class='ms-tree-space'></i>"
            }
            items.forEach((item, index) => {
                item = Object.assign({}, item, {
                    "parent": parent,
                    "level": level,
                    "spaceHtml": spaceHtml
                });
                if ((typeof item.expanded) == "undefined") {
                    item = Object.assign({}, item, {
                        "expanded": false
                    });
                }
                if ((typeof item.show) == "undefined") {
                    item = Object.assign({}, item, {
                        "isShow": false
                    });
                }
                if ((typeof item.isChecked) == "undefined") {
                    item = Object.assign({}, item, {
                        "isChecked": false
                    });
                }
                item = Object.assign({}, item, {
                    "load": (item.expanded ? true : false)
                });
                this.initItems.push(item);
                if (item.children && item.expanded) {
                    this.initData(item.children, level + 1, item);
                }
            })
        },
        //  隐藏显示
        show(item) {
            return ((item.level == 1) || (item.parent && item.parent.expanded && item.isShow));
        },
        toggle(index, item) {
            let level = item.level + 1;
            let spaceHtml = "";
            for (var i = 1; i < level; i++) {
                spaceHtml += "<i class='ms-tree-space'></i>"
            }
            if (item.children) {
                if (item.expanded) {
                    item.expanded = !item.expanded;
                    this.close(index, item);
                } else {
                    item.expanded = !item.expanded;
                    if (item.load) {
                        this.open(index, item);
                    } else {
                        item.load = true;
                        item.children.forEach((child, childIndex) => {
                            this.initItems.splice((index + childIndex + 1), 0, child);
                            //设置监听属性
                            this.$set(this.initItems[index + childIndex + 1], 'parent', item);
                            this.$set(this.initItems[index + childIndex + 1], 'level', level);
                            this.$set(this.initItems[index + childIndex + 1], 'spaceHtml', spaceHtml);
                            this.$set(this.initItems[index + childIndex + 1], 'isShow', true);
                            this.$set(this.initItems[index + childIndex + 1], 'expanded', false);
                        })
                    }
                }
            }
        },
        open(index, item) {
            if (item.children) {
                item.children.forEach((child, childIndex) => {
                    child.isShow = true;
                    if (child.children && child.expanded) {
                        this.open(index + childIndex + 1, child);
                    }
                })
            }
        },
        close(index, item) {
            if (item.children) {
                item.children.forEach((child, childIndex) => {
                    child.isShow = false;
                    child.expanded = false;
                    if (child.children) {
                        this.close(index + childIndex + 1, child);
                    }
                })
            }
        },
        //点击check勾选框,判断是否有children节点 如果有就一并勾选
        handleCheckClick(data, event, index) {
            data.isChecked = !data.isChecked;
            var arr = data.children;
            if (arr) {
                if (data.isChecked) {
                    this.checkGroup.push(data.id);
                    for (let i = 0; i < arr.length; i++) {
                        this.checkGroup.push(arr[i].id)
                    }
                } else {
                    for (var i = 0; i < this.checkGroup.length; i++) {
                        if (this.checkGroup[i] == data.id) {
                            this.checkGroup.splice(i, 1)
                        }
                        for (var j = 0; j < arr.length; j++) {
                            if (this.checkGroup[i] == arr[j].id) {
                                this.checkGroup.splice(i, 1);
                            }
                        }
                    }
                }
            }
        },
        //checkbox 全选 选择事件
        handleCheckAll() {
            // this.checks = !this.checks;
            if (this.checks) {
                this.checkGroup = this.getArray(this.checkGroup.concat(this.All(this.items)))
            } else {
                this.checkGroup = []
            }
            // this.$emit('on-selection-change', this.checkGroup)
        },
        // 数组去重
        getArray(a) {
            var hash = {},
                len = a.length,
                result = [];
            for (var i = 0; i < len; i++) {
                if (!hash[a[i]]) {
                    hash[a[i]] = true;
                    result.push(a[i]);
                }
            }
            return result;
        },
        checkAllGroupChange(data) {
            if (this.dataLength > 0 && data.length === this.dataLength) {
                this.checks = true;
            } else {
                this.checks = false;
            }
            this.$emit('on-selection-change', this.checkGroup)
        },
        All(data) {
            let arr = []
            data.forEach((item) => {
                arr.push(item.id)
                if (item.children && item.children.length > 0) {
                    arr = arr.concat(this.All(item.children));
                }
            })
            return arr
        },
        // 返回树形数据长度
        Length(data) {
            let length = data.length
            data.forEach((child) => {
                if (child.children) {
                    length += this.Length(child.children)
                }
            })
            return length;
        },
        // 返回表头
        renderHeader(column, $index) {
            if ('renderHeader' in this.columns[$index]) {
                return this.columns[$index].renderHeader(column, $index);
            } else {
                return column.title || '#';
            }
        },
        // 返回内容
        renderBody(row, column, index) {
            return row[column.key]
        },
        // 默认选中
        renderCheck(data) {
            let arr = []
            data.forEach((item) => {
                if (item._checked) {
                    arr.push(item.id)
                }
                if (item.children && item.children.length > 0) {
                    arr = arr.concat(this.renderCheck(item.children));
                }
            })
            return arr
        },
        // 深度拷贝函数
        deepCopy(data) {
            var t = this.type(data),
                o, i, ni;
            if (t === 'array') {
                o = [];
            } else if (t === 'object') {
                o = {};
            } else {
                return data;
            }
            if (t === 'array') {
                for (i = 0, ni = data.length; i < ni; i++) {
                    o.push(this.deepCopy(data[i]));
                }
                return o;
            } else if (t === 'object') {
                for (i in data) {
                    o[i] = this.deepCopy(data[i]);
                }
                return o;
            }
        },
        type(obj) {
            var toString = Object.prototype.toString;
            var map = {
                '[object Boolean]': 'boolean',
                '[object Number]': 'number',
                '[object String]': 'string',
                '[object Function]': 'function',
                '[object Array]': 'array',
                '[object Date]': 'date',
                '[object RegExp]': 'regExp',
                '[object Undefined]': 'undefined',
                '[object Null]': 'null',
                '[object Object]': 'object'
            };
            return map[toString.call(obj)];
        }
    },
    beforeDestroy() {
        window.onresize = null
    }
}
</script>
<style>
.autoTbale {
    overflow: auto;
}
.autoTbale table {
    width: 100%;
    border-spacing: 0;
    border-collapse: collapse;
}
.autoTbale .table-bordered {
    border: 1px solid #ebebeb;
}
.autoTbale .table > tbody > tr > td,
.autoTbale .table > tbody > tr > th,
.autoTbale .table > thead > tr > td,
.autoTbale .table > thead > tr > th {
    border-top: 1px solid #e7eaec;
    line-height: 1.42857;
    padding: 8px;
    vertical-align: middle;
    text-align: left;
}
.autoTbale .table-bordered > tbody > tr > td,
.autoTbale .table-bordered > tbody > tr > th,
.autoTbale .table-bordered > tfoot > tr > td,
.autoTbale .table-bordered > tfoot > tr > th,
.autoTbale .table-bordered > thead > tr > td,
.autoTbale .table-bordered > thead > tr > th {
    border: 1px solid #e7e7e7;
}
.autoTbale .table > thead > tr > th {
    border-bottom: 1px solid #ddd;
}
.autoTbale .table-bordered > thead > tr > td,
.autoTbale .table-bordered > thead > tr > th {
    background-color: #f5f5f6;
}
.autoTbale .hl-tree-table > thead > tr {
    background-color: #fbfbfb;
}
.autoTbale .hl-tree-table thead tr {
    height: 38.88px;
}
.autoTbale .hl-tree-table tbody tr {
    height: 48px;
}
.autoTbale .hl-tree-table > tbody > .child-tr {
    background-color: #fff;
}
.autoTbale .hl-tree-table > tbody > .body-tr:hover {
    background-color: #ebf7ff;
}
.autoTbale label {
    margin: 0 8px;
}
.autoTbale .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 20px;
    height: 14px;
}
.autoTbale .ms-tree-space::before {
    content: '';
}
/*.autoTbale #hl-tree-table th > label {
    margin: 0;
} */
.autoTbale table {
    border-bottom: 1px solid #dcdee2;
}
</style>